My 98 jeep have been having problems with it. It starts up cold, once it heats up.it starts to misfire stumbling stalls out, it is throwing codes P0300,P0301,P302,P303, P0171 have changed the cap, rotor, sensor under the distributor. If the rpms are up it seems to run ok. Please help husband wants to sell moms ride.
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Re: 98 jeep starts cold sputters, no power
The p0171 code is for a fuel system lean code......possible causes are a cracked exhaust manifold.....bad o2 sensor...bad coolant temp sensor fuel pump.....lean fuel can cause the other codes you have for misfires
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If your vehicle has a carburetor, I'd say you've got a problem with your choke, specifically your cold/curb idle dashpot. What is your fuel system, "air mixture problems" sounds like a carburetor to me.
Just means it isn't warmed up yet when sputters and misfires. Most likely a bad connection on the temperature sending unit in the engine or that sending unit is faulty. This sending unit tells the computer when engine is warm or cold and has to be functional. When working properly, it tells the computer to put engine in cold start mode, which it is not doing. The sensor is stuck in open position or warm mode and not giving the engine enough fuel when cold making it misfire and sputter. Fix that and you'll have no other problems with revving either.
bad need of a tuneup? like new spark plugs, ?
172 , is 02 rich/ lean warning. this one is low oxy for rich.
this code can just be a victim. for sure , with misfire.
means 02 sensor stuck at rich,
what is water temp in engine coolant, at failure? less than 150F?
could be lots of things.
leaking injectors, bad fuel.
injector sticking> causing misfire.
id use a scan tool and watch all sensor when it fails.
too high fuel pressure.
misfires cold, but only luke warm cold starts not fully cold.
just one DTC, no P0300 or 30x misfire codes, not even P0300 pendings?